Infant has meningitis A+C, arm swelling with hard lumps, what's the cause?

Patient's question:

Sure, here is the translation of the content you provided:
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No
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Doctor's answer:

According to your description, it may be related to the injection of AC vaccine. Generally, there is no problem after injecting the AC vaccine. If there is a lump at the injection site, don't be afraid. Apply heat and it will improve quickly.

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